I would like to trigger an input based on the beam between an IR LED and Photodiode being broken. The attached image is a circuit I found to do this with a Phototransistor. If I want to do the same but with a photodiode instead, can I simply replace the PT with a reverse bias PD?
The reason I want to use the PD is that I already have some BPV10NF photodiodes in my parts bin and from what I read a PD is more sensitive than a PT which might be beneficial. I like the look of the attached schematic as my understanding is that the SCR acts as a type of latch - holding the input in the triggered state.
Am I correct in thinking i can simply substitute the PT for a reversed PD or is there more to it that that?